Pre-Algebra help? 4 questions?

??Birdy!!XP

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17. Find the midpoint of the segment with endpoints. A(-7,6) and B(-1,1)
(This I have no idea how to solve, can someone explain the steps for me?)

18. A building casts a 52-foot shadow at the same time Tonya casts a 4-foot shadow. Tonya and her shadow form a triangle that is similar to the triangle formed by the building and its shadow. If Tonya is 5 feet tall, what is the height h of the building.
(This I think I may know how to do, but I'm confused about the wording of the question...can you re-word this for me?)

An airplane is flying 0.75 miles above the ground. If the piolet must begin a 4 degrees descent to an airport runway,how far away is the airplane from the begining of the runway (in ground distance) to the nearest tenth of a mile?

(I have no idea where to start on this one. Can you explain how to set it up for me?)

Explain why the tangent of 45 (degrees) equals 1.


Thanks!!(:
 
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